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Data acquisition method: Acquisition method is pull from the provider's location to ECMWF's premises if not specified
Data transfer check: Is the data transfer checked to avoid any technical issues on the way from provider's location to ECMWF's premises? Was the data delivered bit identical?
Data delay check: Is the potential delay of data availability checked on the provider's side?
Data completeness check: Is the data content (number of expected fields; reference field list etc) checked on the provider's side?
Data quality check: Is there any data quality control to avoid e.g. unrealistic parameter values due to interpolation or any other kind of error either scientific or technical?

Number of operational incidents since May 2018 (beginning of detailed statistics) per quarters

(*) there existed some few older incidents since 2017

The below overview is restricted to user group "ecmwf" only.